check out the videos. the animals are all made out of plastic tubes...
"Theo Jansen wants to make “life” and he figures the best way to do it is to start from scratch.
A self-styled god, Jansen is evolving an entirely new line of animals: immense multi-legged walking critters designed to roam the Dutch coastline, feeding on gusts of wind. Over the years, successive generations of his creatures have evolved into increasingly complex animals that walk by flapping wings in response to the wind, discerning obstacles in their path through feelers and even hammering themselves into the sand on sensing an approaching storm.
A scientist-turned-artist, Jansen’s bizarre beach animals have their roots in a computer program that he designed 17 years ago in which virtual four-legged creatures raced against each other to identify survivors fit enough to reproduce. Determined to translate the evolutionary process off-screen, Jansen went to a local shop and found his own alternative to the biological cell — the humble plastic tube"